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KonstantinChe [14]
3 years ago
14

after a certain pesticide compound is applied to crops its decomposition is a first order reaction with a half life of 56 days.

what is the rate constan for the decomposition reacion
Chemistry
1 answer:
antoniya [11.8K]3 years ago
4 0

Answer:

Rate constant = 0.01238 days⁻¹

Explanation:

The first order reaction has as general equation:

Ln[A] = -kt + Ln[A]₀

<em>Where [A] is concentration of the reactant after time t,</em>

<em>k is rate constant</em>

<em>And [A]₀ the initial concentration of the reactant</em>

<em />

The half-life is the time required to reach the half of the initial concentration. If [A]₀ = 1; [A] = 1/2

Replacing:

Ln[1/2] = -kt + Ln[1]

-0.693 = -k*56days

0.01238days⁻¹ = k

<h3>Rate constant = 0.01238 days⁻¹</h3>

<em />

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